Survey notifications

observe_survey_submit/2: A survey has been filled in and submitted.
observe_survey_get_handlers/3: Fetch list of handlers for survey submits.
observe_survey_is_allowed_results_download/2: Check if the current user is allowed to download a survey.
observe_survey_is_submit/2: Check if a question (page block) is a submitting question.
observe_survey_result_column_values/3: Modify row with answers for export. The header columns are given and the values that are known are set in the folded value. The user_id is the user who filled…
observe_survey_result_columns/3: Add header columns for export. The values are the names of the answers and the text displayed above the column. The text format is for a complete export, the…